This section provides an overview for levels as well as their applications and principles. Also, please take a look at the list of 10 level manufacturers and their company rankings.
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A level is an instrument for checking the degree to which an arbitrary surface (surface to be measured) is inclined relative to a reference (horizontal or vertical). It is also called a leveler.
A level is a cylindrical, sealed glass tube filled with a liquid such as alcohol or ether and partially filled with air bubbles. When the level is placed on the surface to be measured, the position of the bubble moves in accordance with the inclination of the surface. The inclination of the surface is checked by reading the scale waved on the glass tube at that position.
Some levels display the reading digitally, and some laser level is equipped with a laser pointer to check the level at a "distance."
Levels are used to level equipment when it is being installed. The levels are placed on the reference surface of the equipment to be installed and the adjusters of the equipment are adjusted so that the reference surface are levels.
Levels are also used to check the distortion of the outer circumference of rollers and to check the parallelism of conveyor rollers on printing presses.
They are also used in construction, civil engineering, and surveying. They are used not to check the levelness of an object, but to establish a reference.
As mentioned above, levels are cylindrical glass tube filled with liquid and partially filled with air bubbles. This glass tube is held in an enclosure with a surface parallel to the glass tube. If the horizontal glass tube is parallel to the ground, the bubble is located in the middle of the glass tube. If the right side of the glass capillary is higher than the left side, the bubble will move to the right side. Since the glass capillary is marked with a scale, the tilt is checked by reading the scale at the position of the bubble. This type of levels are also called bubble levels.
Laser levels have a built-in laser pointer. The laser pointer can be used to level a distant location and is mainly used on construction sites.
A laser level is attached to a tripod and adjusted so that it is parallel to the tripod. Once parallelism is achieved, the laser pointer (horizontal light) can be used to determine the point of parallelism, even at a distance. For example, when laying pipe, it is possible to point out the position where a hole is to be drilled in the wall where the pipe is to be extended. When installing speakers on a wall in a gymnasium, for example, it is necessary to install them at the same height on the left and right sides.
Because of their simple construction and relatively easy operation, laser levels are used in a wide variety of applications.
*Including some distributors, etc.
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